I won't be able to package FindBugs for EPEL 6, because one of the packages requires Maven to build, and Maven isn't in EPEL 6 (see https://bugzilla.redhat.com/show_bug.cgi?id=1109385).
The situation for EPEL 7 looks better as Maven is included. However I do know that at least ASM 5 isn't available.
I almost gave up with getting FindBugs into EPEL last night (https://fedorahosted.org/rel-eng/ticket/6079) but I will keep going for now with EPEL 7 and see what can be done about ASM 5...